Tehran vowed to respond to the U.S. after it attacked and seized an Iranian-flagged cargo ship, calling the armed boarding an "act of piracy."
U.S. Seizes Iranian-flagged Ship Near Strait Of Hormuz And Tehran Vows To Respond
Trump on social media said the ship was warned by a U.S. Navy guided missile destroyer in the Gulf of Oman to stop, but it did not.


